Adjust the volume on iPod touch
When you’re listening to songs, movies, or other media on iPod touch, you can use the buttons on the side of your device to adjust the audio volume. Otherwise, the buttons control the volume for the ringer, alerts, and other sound effects. You can also use Siri to turn the volume up or down.
Siri: Say something like: “Turn up the volume” or “Turn down the volume.” Learn how to ask Siri.
WARNING: For information about avoiding hearing loss, see Important safety information for iPod touch.
Lock the ringer and alert volumes in Settings
Go to Settings
.Tap Sounds.
Turn off Change with Buttons.
Adjust the volume in Control Center
When iPod touch is locked or when you’re using an app, you can adjust the volume in Control Center.
Open Control Center, then drag 
.
Temporarily silence calls, alerts, and notifications
Open Control Center, tap Focus, then tap Do Not Disturb. (See Set Do Not Disturb.)
On iPod touch, there are several ways to protect your hearing from loud volume while listening to headphone audio. See Use headphone audio level features on iPod touch.